I'm just curious, Brodin. What range are you expecting from your IR link?
Well, i need it to work
perfectly within 15 meters. I am going to use it as an identifications system. I am doing roadracing and i am constructing a laptimer that will stand by the side of the track and notice which bike that's passing and log the laptimes for each bike.
It sends a 6-bit string which is received by the PIC by the side of the road.
I have tested it and it works great with the 6V version. I passed the receiver in 200km/h (120 mph) and that worked just fine. But i need to get the 3V version to work so i need less batteries.
I have meassured the current through the LED which is just about 0.3 A (it is supposed to be 1A!).
I have meassured the voltage drops over the components.
U = 3V
Uled = 1.8 V
Ut = 0.8 V
Ur = 0.4 V
Would it be better if i changed the darlington to a normal transistor? Or can i change the resistor to a 0.4 ohm (0.4/1). Would that work good, not just theoretically?